support BigInt literals (#4583)

1 files changed, 15 insertions, 2 deletions

diff --git a/lib/ast.js b/lib/ast.js
index ab2559c2..1a09d4de 100644
--- a/lib/ast.js
+++ b/lib/ast.js
@@ -249,7 +249,7 @@ var AST_BlockScope = DEFNODE("BlockScope", "enclosed functions make_def parent_s
         enclosed: "[SymbolDef*/S] a list of all symbol definitions that are accessed from this scope or any subscopes",
         functions: "[Object/S] like `variables`, but only lists function declarations",
         parent_scope: "[AST_Scope?/S] link to the parent scope",
-        variables: "[Object/S] a map of name -> SymbolDef for all variables/functions defined in this scope",
+        variables: "[Object/S] a map of name ---> SymbolDef for all variables/functions defined in this scope",
     },
     clone: function(deep) {
         var node = this._clone(deep);
@@ -472,7 +472,7 @@ var AST_Scope = DEFNODE("Scope", "uses_eval uses_with", {
 var AST_Toplevel = DEFNODE("Toplevel", "globals", {
     $documentation: "The toplevel scope",
     $propdoc: {
-        globals: "[Object/S] a map of name -> SymbolDef for all undeclared names",
+        globals: "[Object/S] a map of name ---> SymbolDef for all undeclared names",
     },
     wrap: function(name) {
         var body = this.body;
@@ -1440,6 +1440,19 @@ var AST_Number = DEFNODE("Number", "value", {
     },
     _validate: function() {
         if (typeof this.value != "number") throw new Error("value must be number");
+        if (!isFinite(this.value)) throw new Error("value must be finite");
+        if (this.value < 0) throw new Error("value cannot be negative");
+    },
+}, AST_Constant);
+
+var AST_BigInt = DEFNODE("BigInt", "value", {
+    $documentation: "A BigInt literal",
+    $propdoc: {
+        value: "[string] the numeric representation",
+    },
+    _validate: function() {
+        if (typeof this.value != "string") throw new Error("value must be string");
+        if (this.value[0] == "-") throw new Error("value cannot be negative");
     },
 }, AST_Constant);